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Liang Z, Ralph-Epps T, Schmidtke MW, Lazcano P, Denis SW, Balážová M, Teixeira J NDR, Chakkour M, Hazime S, Ren M, Schlame M, Houtkooper RH, Greenberg ML. Upregulation of the AMPK-FOXO1-PDK4 pathway is a primary mechanism of pyruvate dehydrogenase activity reduction in tafazzin-deficient cells. Sci Rep 2024; 14:11497. [PMID: 38769106 DOI: 10.1038/s41598-024-62262-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Accepted: 05/15/2024] [Indexed: 05/22/2024] Open
Abstract
Barth syndrome (BTHS) is a rare disorder caused by mutations in the TAFAZZIN gene. Previous studies from both patients and model systems have established metabolic dysregulation as a core component of BTHS pathology. In particular, features such as lactic acidosis, pyruvate dehydrogenase (PDH) deficiency, and aberrant fatty acid and glucose oxidation have been identified. However, the lack of a mechanistic understanding of what causes these conditions in the context of BTHS remains a significant knowledge gap, and this has hindered the development of effective therapeutic strategies for treating the associated metabolic problems. In the current study, we utilized tafazzin-knockout C2C12 mouse myoblasts (TAZ-KO) and cardiac and skeletal muscle tissue from tafazzin-knockout mice to identify an upstream mechanism underlying impaired PDH activity in BTHS. This mechanism centers around robust upregulation of pyruvate dehydrogenase kinase 4 (PDK4), resulting from hyperactivation of AMP-activated protein kinase (AMPK) and subsequent transcriptional upregulation by forkhead box protein O1 (FOXO1). Upregulation of PDK4 in tafazzin-deficient cells causes direct phospho-inhibition of PDH activity accompanied by increased glucose uptake and elevated intracellular glucose concentration. Collectively, our findings provide a novel mechanistic framework whereby impaired tafazzin function ultimately results in robust PDK4 upregulation, leading to impaired PDH activity and likely linked to dysregulated metabolic substrate utilization. This mechanism may underlie previously reported findings of BTHS-associated metabolic dysregulation.
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Affiliation(s)
- Zhuqing Liang
- Department of Biological Sciences, Wayne State University, Detroit, MI, USA
| | - Tyler Ralph-Epps
- Department of Biological Sciences, Wayne State University, Detroit, MI, USA
| | | | - Pablo Lazcano
- Department of Biological Sciences, Wayne State University, Detroit, MI, USA
| | - Simone W Denis
- Laboratory Genetic Metabolic Diseases, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
- Amsterdam Gastroenterology Endocrinology and Metabolism Institute, Amsterdam, The Netherlands
- Amsterdam Cardiovascular Sciences Institute, Amsterdam, The Netherlands
- Emma Center for Personalized Medicine, Amsterdam UMC, Amsterdam, The Netherlands
| | - Mária Balážová
- Department of Membrane Biochemistry, Institute of Animal Biochemistry and Genetics, Centre of Biosciences, Slovak Academy of Sciences, 84005, Bratislava, Slovakia
| | | | - Mohamed Chakkour
- Department of Biological Sciences, Wayne State University, Detroit, MI, USA
| | - Sanaa Hazime
- Department of Biological Sciences, Wayne State University, Detroit, MI, USA
| | - Mindong Ren
- Department of Anesthesiology, Perioperative Care, and Pain Medicine, Grossman School of Medicine, New York University, New York, NY, USA
| | - Michael Schlame
- Department of Anesthesiology, Perioperative Care, and Pain Medicine, Grossman School of Medicine, New York University, New York, NY, USA
| | - Riekelt H Houtkooper
- Laboratory Genetic Metabolic Diseases, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
- Amsterdam Gastroenterology Endocrinology and Metabolism Institute, Amsterdam, The Netherlands
- Amsterdam Cardiovascular Sciences Institute, Amsterdam, The Netherlands
- Emma Center for Personalized Medicine, Amsterdam UMC, Amsterdam, The Netherlands
| | - Miriam L Greenberg
- Department of Biological Sciences, Wayne State University, Detroit, MI, USA.
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Alchus Laiferová N, Nemec M, Vernerová L, Balážová M, Vokurková M, Oreská S, Klein M, Špiritović M, Tomčík M, Vencovský J, Ukropec J, Ukropcová B. MyomiRs in cultured muscle cells from patients with idiopathic inflammatory myopathy are modulated by disease but not by 6-month exercise training. Clin Exp Rheumatol 2022; 40:346-357. [DOI: 10.55563/clinexprheumatol/69z7za] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Accepted: 01/17/2022] [Indexed: 11/13/2022]
Affiliation(s)
- Nikoleta Alchus Laiferová
- Institute of Experimental Endocrinology, Biomedical Research Centre, Slovak Academy of Sciences, Bratislava, and Institute of Pathophysiology, Faculty of Medicine, Comenius University, Bratislava, Slovakia
| | - Michal Nemec
- Institute of Experimental Endocrinology, Biomedical Research Centre, Slovak Academy of Sciences, Bratislava, Slovakia
| | | | - Mária Balážová
- Centre of Biosciences, Slovak Academy of Sciences, Bratislava, Slovakia
| | | | - Sabína Oreská
- Institute of Rheumatology, Prague, and Department of Rheumatology, First Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Martin Klein
- Institute of Rheumatology, Prague, and Department of Rheumatology, First Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Maja Špiritović
- Institute of Rheumatology, Prague, and Department of Physiotherapy, Faculty of Physical Education and Sport, Charles University, Prague, Czech Republic
| | - Michal Tomčík
- Department of Rheumatology, First Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Jiří Vencovský
- Institute of Rheumatology, Prague, and Department of Rheumatology, First Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Jozef Ukropec
- Institute of Experimental Endocrinology, Biomedical Research Centre, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Barbara Ukropcová
- Institute of Experimental Endocrinology, Biomedical Research Centre, Slovak Academy of Sciences, Bratislava, and Institute of Pathophysiology, Faculty of Medicine, Comenius University, Bratislava, Slovakia.
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3
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Káňovičová P, Čermáková P, Kubalová D, Bábelová L, Veselá P, Valachovič M, Zahumenský J, Horváth A, Malínský J, Balážová M. Blocking phosphatidylglycerol degradation in yeast defective in cardiolipin remodeling results in a new model of the Barth syndrome cellular phenotype. J Biol Chem 2021; 298:101462. [PMID: 34864056 PMCID: PMC8728584 DOI: 10.1016/j.jbc.2021.101462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Revised: 11/26/2021] [Accepted: 11/29/2021] [Indexed: 11/01/2022] Open
Abstract
Barth syndrome (BTHS) is an inherited mitochondrial disorder characterized by a decrease in total cardiolipin and the accumulation of its precursor monolysocardiolipin due to the loss of the transacylase enzyme tafazzin. However, the molecular basis of BTHS pathology is still not well understood. Here we characterize the double mutant pgc1Δtaz1Δ of Saccharomyces cerevisiae deficient in phosphatidylglycerol-specific phospholipase C and tafazzin as a new yeast model of BTHS. Unlike the taz1Δ mutant used to date, this model accumulates phosphatidylglycerol, thus better approximating the human BTHS cells. We demonstrate that increased phosphatidylglycerol in this strain leads to more pronounced mitochondrial respiratory defects and an increased incidence of aberrant mitochondria compared to the single taz1Δ mutant. We also show that the mitochondria of the pgc1Δtaz1Δ mutant exhibit a reduced rate of respiration due to decreased cytochrome c oxidase and ATP synthase activities. Finally, we determined that the mood-stabilizing anticonvulsant valproic acid has a positive effect on both lipid composition and mitochondrial function in these yeast BTHS models. Overall, our results show that the pgc1Δtaz1Δ mutant better mimics the cellular phenotype of BTHS patients than taz1Δ cells, both in terms of lipid composition and the degree of disruption of mitochondrial structure and function. This favors the new model for use in future studies.
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Affiliation(s)
- Paulína Káňovičová
- Department of Membrane Biochemistry, Institute of Animal Biochemistry and Genetics, Centre of Biosciences, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Petra Čermáková
- Department of Biochemistry, Faculty of Natural Sciences, Comenius University, Bratislava, Slovakia
| | - Dominika Kubalová
- Department of Membrane Biochemistry, Institute of Animal Biochemistry and Genetics, Centre of Biosciences, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Lenka Bábelová
- Department of Membrane Biochemistry, Institute of Animal Biochemistry and Genetics, Centre of Biosciences, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Petra Veselá
- Department of Functional Organization of Biomembranes, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Martin Valachovič
- Department of Membrane Biochemistry, Institute of Animal Biochemistry and Genetics, Centre of Biosciences, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Jakub Zahumenský
- Department of Functional Organization of Biomembranes, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Anton Horváth
- Department of Biochemistry, Faculty of Natural Sciences, Comenius University, Bratislava, Slovakia
| | - Jan Malínský
- Department of Functional Organization of Biomembranes, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Prague, Czech Republic.
| | - Mária Balážová
- Department of Membrane Biochemistry, Institute of Animal Biochemistry and Genetics, Centre of Biosciences, Slovak Academy of Sciences, Bratislava, Slovakia.
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Laiferová N, Nemec M, Vernerová L, Balážová M, Vokurková M, Klein M, Špiritović M, Tomčík M, Vencovský J, Ukropec J, Ukropcová B. Lower serum vitamin D in patients with idiopathic inflammatory myopathies is related to altered lipid metabolism in patients’ muscle cells. FASEB J 2021. [DOI: 10.1096/fasebj.2021.35.s1.05191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Nikoleta Laiferová
- Biomedical Research Center, Slovak Acad of Sci, Bratislava, SlovakiaBratislava
| | - Michal Nemec
- Biomedical Research Center, Slovak Acad of Sci, Bratislava, SlovakiaBratislava
| | | | - Mária Balážová
- Centre of Biosciences, Slovak Acad of Sci, Bratislava, SlovakiaBratislava
| | | | - Martin Klein
- Institute of Rheumatology, Prague, CzechiaPrague
| | | | | | | | - Jozef Ukropec
- Biomedical Research Center, Slovak Acad of Sci, Bratislava, SlovakiaBratislava
| | - Barbara Ukropcová
- Biomedical Research Center, Slovak Acad of Sci, Bratislava, SlovakiaBratislava
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5
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Nemec M, Vernerová L, Laiferová N, Balážová M, Vokurková M, Kurdiová T, Oreská S, Kubínová K, Klein M, Špiritović M, Tomčík M, Vencovský J, Ukropec J, Ukropcová B. Altered dynamics of lipid metabolism in muscle cells from patients with idiopathic inflammatory myopathy is ameliorated by 6 months of training. J Physiol 2020; 599:207-229. [PMID: 33063873 DOI: 10.1113/jp280468] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Accepted: 10/13/2020] [Indexed: 12/17/2022] Open
Abstract
KEY POINTS Regular exercise improves muscle functional capacity and clinical state of patients with idiopathic inflammatory myopathy (IIM). In our study, we used an in vitro model of human primary muscle cell cultures, derived from IIM patients before and after a 6-month intensive supervised training intervention to assess the impact of disease and exercise on lipid metabolism dynamics. We provide evidence that muscle cells from IIM patients display altered dynamics of lipid metabolism and impaired adaptive response to saturated fatty acid load compared to healthy controls. A 6-month intensive supervised exercise training intervention in patients with IIM mitigated disease effects in their cultured muscle cells, improving or normalizing their capacity to handle lipids. These findings highlight the putative role of intrinsic metabolic defects of skeletal muscle in the pathogenesis of IIM and the positive impact of exercise, maintained in vitro by yet unknown epigenetic mechanisms. ABSTRACT Exercise improves skeletal muscle function, clinical state and quality of life in patients with idiopathic inflammatory myopathy (IIM). Our aim was to identify disease-related metabolic perturbations and the impact of exercise in skeletal muscle cells of IIM patients. Patients underwent a 6-month intensive supervised training intervention. Muscle function, anthropometric and metabolic parameters were examined and muscle cell cultures were established (m. vastus lateralis; Bergström needle biopsy) before and after training from patients and sedentary age/sex/body mass index-matched controls. [14 C]Palmitate was used to determine fat oxidation and lipid synthesis (thin layer chromatography). Cells were exposed to a chronic (3 days) and acute (3 h) metabolic challenge (the saturated fatty acid palmitate, 100 μm). Reduced oxidative (intermediate metabolites, -49%, P = 0.034) and non-oxidative (diglycerides, -38%, P = 0.013) lipid metabolism was identified in palmitate-treated muscle cells from IIM patients compared to controls. Three days of palmitate exposure elicited distinct regulation of oxidative phosphorylation (OxPHOS) complex IV and complex V/ATP synthase (P = 0.012/0.005) and adipose triglyceride lipase in patients compared to controls (P = 0.045) (immunoblotting). Importantly, 6 months of training in IIM patients improved lipid metabolism (CO2 , P = 0.010; intermediate metabolites, P = 0.041) and activation of AMP kinase (P = 0.007), and nearly normalized palmitate-induced changes in OxPHOS proteins in myotubes from IIM patients, in parallel with improvements of patients' clinical state. Myotubes from IIM patients displayed altered dynamics of lipid metabolism and impaired response to metabolic challenge with saturated fatty acid. Our observations suggest that metabolic defects intrinsic to skeletal muscle could represent non-immune pathomechanisms, which can contribute to muscle weakness in IIM. A 6-month training intervention mitigated disease effects in muscle cells in vitro, indicating the existence of epigenetic regulatory mechanisms.
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Affiliation(s)
- M Nemec
- Biomedical Research Centre, Slovak Academy of Sciences, Institute of Experimental Endocrinology, Bratislava, Slovakia
| | - L Vernerová
- Institute of Rheumatology and Department of Rheumatology, First Faculty of Medicine, Charles University, Prague, Czech Republic
| | - N Laiferová
- Biomedical Research Centre, Slovak Academy of Sciences, Institute of Experimental Endocrinology, Bratislava, Slovakia.,Institute of Pathophysiology, Faculty of Medicine, Comenius University, Bratislava, Slovakia
| | - M Balážová
- Centre of Biosciences, Slovak Academy of Sciences, Bratislava, Slovakia
| | - M Vokurková
- Institute of Rheumatology and Department of Rheumatology, First Faculty of Medicine, Charles University, Prague, Czech Republic
| | - T Kurdiová
- Biomedical Research Centre, Slovak Academy of Sciences, Institute of Experimental Endocrinology, Bratislava, Slovakia
| | - S Oreská
- Institute of Rheumatology and Department of Rheumatology, First Faculty of Medicine, Charles University, Prague, Czech Republic
| | - K Kubínová
- Institute of Rheumatology and Department of Rheumatology, First Faculty of Medicine, Charles University, Prague, Czech Republic
| | - M Klein
- Institute of Rheumatology and Department of Rheumatology, First Faculty of Medicine, Charles University, Prague, Czech Republic
| | - M Špiritović
- Institute of Rheumatology and Department of Rheumatology, First Faculty of Medicine, Charles University, Prague, Czech Republic.,Department of Physiotherapy, Faculty of Physical Education and Sport, Charles University, Prague, Czech Republic
| | - M Tomčík
- Institute of Rheumatology and Department of Rheumatology, First Faculty of Medicine, Charles University, Prague, Czech Republic
| | - J Vencovský
- Institute of Rheumatology and Department of Rheumatology, First Faculty of Medicine, Charles University, Prague, Czech Republic
| | - J Ukropec
- Biomedical Research Centre, Slovak Academy of Sciences, Institute of Experimental Endocrinology, Bratislava, Slovakia
| | - B Ukropcová
- Biomedical Research Centre, Slovak Academy of Sciences, Institute of Experimental Endocrinology, Bratislava, Slovakia.,Institute of Pathophysiology, Faculty of Medicine, Comenius University, Bratislava, Slovakia
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Kubalová D, Káňovičová P, Veselá P, Awadová T, Džugasová V, Daum G, Malínský J, Balážová M. The lipid droplet protein Pgc1 controls the subcellular distribution of phosphatidylglycerol. FEMS Yeast Res 2020; 19:5524364. [PMID: 31247640 DOI: 10.1093/femsyr/foz045] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Accepted: 06/26/2019] [Indexed: 12/12/2022] Open
Abstract
The biosynthesis of yeast phosphatidylglycerol (PG) takes place in the inner mitochondrial membrane. Outside mitochondria, the abundance of PG is low. Here, we present evidence that the subcellular distribution of PG is maintained by the locally controlled enzymatic activity of the PG-specific phospholipase, Pgc1. A fluorescently labeled Pgc1 protein accumulates on the surface of lipid droplets (LD). We show, however, that LD are not only dispensable for Pgc1-mediated PG degradation, but do not even host any phospholipase activity of Pgc1. Our in vitro assays document the capability of LD-accumulated Pgc1 to degrade PG upon entry to the membranes of the endoplasmic reticulum, mitochondria and even of artificial phospholipid vesicles. Fluorescence recovery after photobleaching analysis confirms the continuous exchange of GFP-Pgc1 within the individual LD in situ, suggesting that a steady-state equilibrium exists between LD and membranes to regulate the immediate phospholipase activity of Pgc1. In this model, LD serve as a storage place and shelter Pgc1, preventing its untimely degradation, while both phospholipase activity and degradation of the enzyme occur in the membranes.
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Affiliation(s)
- Dominika Kubalová
- Department of Membrane Biochemistry, Institute of Animal Biochemistry and Genetics, Centre of Biosciences, Slovak Academy of Sciences, 84005 Bratislava, Slovakia
| | - Paulína Káňovičová
- Department of Membrane Biochemistry, Institute of Animal Biochemistry and Genetics, Centre of Biosciences, Slovak Academy of Sciences, 84005 Bratislava, Slovakia
| | - Petra Veselá
- Department of Microscopy, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic,14220 Prague, Czech Republic
| | - Thuraya Awadová
- Department of Microscopy, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic,14220 Prague, Czech Republic
| | - Vladimíra Džugasová
- Department of Genetics, Faculty of Natural Sciences, Comenius University, 84215 Bratislava, Slovakia
| | - Günther Daum
- Institute of Biochemistry, Graz University of Technology, 8010 Graz, Austria
| | - Jan Malínský
- Department of Microscopy, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic,14220 Prague, Czech Republic
| | - Mária Balážová
- Department of Membrane Biochemistry, Institute of Animal Biochemistry and Genetics, Centre of Biosciences, Slovak Academy of Sciences, 84005 Bratislava, Slovakia
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Virčíková V, Pokorná L, Tahotná D, Džugasová V, Balážová M, Griač P. Schizosaccharomyces pombe cardiolipin synthase is part of a mitochondrial fusion protein regulated by intron retention. Biochim Biophys Acta Mol Cell Biol Lipids 2018; 1863:1331-1344. [PMID: 29958934 DOI: 10.1016/j.bbalip.2018.06.019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Revised: 06/08/2018] [Accepted: 06/23/2018] [Indexed: 11/29/2022]
Abstract
Cardiolipin (CL) is a unique lipid component of mitochondria in all eukaryotes. It is important for the architecture of mitochondrial membranes and for mitochondrial dynamics. CL also creates a highly specific microenvironment of mitochondrial protein machineries. CL biosynthetic pathway is, however, only partially characterized in the fission yeast Schizosaccharomyces pombe. Here we show that CL synthase is an essential protein in S. pombe. It is encoded by the ORF SPAC22A12.08c as a C terminal part of a tandem fusion protein together with a mitochondrial hydrolase of unknown function. Expression of S. pombe CL synthase is able to complement deletion of the CRD1 gene of Saccharomyces cerevisiae and, vice versa, S. cerevisiae CRD1 gene complements deletion of S. pombe SPAC22A12.08c. The proper expression of CL synthase and its partner in the tandem protein, the mitochondrial hydrolase, is regulated at the level of alternate intron splicing. The first part of the SPAC22A12.08c fusion protein could be translated from both major SPAC22A12.08c derived mRNAs, with and without intron IV. Functional CL synthase, however, is produced only from the minor SPAC22A12.08c derived mRNA that has intron IV retained. Thus, intron retention is a novel mechanism for the differential expression of two proteins that evolved as a fusion protein and are under the control of the same promoter.
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Affiliation(s)
- Veronika Virčíková
- Centre of Biosciences, Institute of Animal Biochemistry and Genetics, Slovak Academy of Sciences, Dúbravská cesta 9, 840 05 Bratislava, Slovakia
| | - Lucia Pokorná
- Centre of Biosciences, Institute of Animal Biochemistry and Genetics, Slovak Academy of Sciences, Dúbravská cesta 9, 840 05 Bratislava, Slovakia
| | - Dana Tahotná
- Centre of Biosciences, Institute of Animal Biochemistry and Genetics, Slovak Academy of Sciences, Dúbravská cesta 9, 840 05 Bratislava, Slovakia
| | - Vladimíra Džugasová
- Department of Genetics, Faculty of Natural Sciences, Comenius University, Ilkovičova 6, 842 15 Bratislava, Slovakia
| | - Mária Balážová
- Centre of Biosciences, Institute of Animal Biochemistry and Genetics, Slovak Academy of Sciences, Dúbravská cesta 9, 840 05 Bratislava, Slovakia
| | - Peter Griač
- Centre of Biosciences, Institute of Animal Biochemistry and Genetics, Slovak Academy of Sciences, Dúbravská cesta 9, 840 05 Bratislava, Slovakia.
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Vaškovičová K, Awadová T, Veselá P, Balážová M, Opekarová M, Malinsky J. mRNA decay is regulated via sequestration of the conserved 5′-3′ exoribonuclease Xrn1 at eisosome in yeast. Eur J Cell Biol 2017; 96:591-599. [DOI: 10.1016/j.ejcb.2017.05.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Revised: 04/07/2017] [Accepted: 05/02/2017] [Indexed: 01/08/2023] Open
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Balážová M, Gallová I, Praško J, Šlepecký M, Kotianová A. Family Environment as Predictor of Adolescents’ Loneliness. Eur Psychiatry 2017. [DOI: 10.1016/j.eurpsy.2017.01.259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Abstract
IntroductionAt the present time, adolescents are in particular vulnerable to feelings of loneliness. They are gradually emancipating from their family and establish relationships with peers. Among the important predictors of loneliness belong genetic and personal variables and factors of social environment.Objectives and aimsTo examine predictors of adolescents’ loneliness which are located in family environment. To find out how empathy, emotional relationship and control by both of parents contribute to loneliness of adolescent boys and girls.MethodsWe examined 206 adolescents in the age from 10 to 18 years through Basic Empathy Scale, Parenting Style Scale and UCLA Loneliness Scale. Stepwise multiple linear regression analysis was used for data analysis.ResultsThe significant predictors of boys’ loneliness in family environment are emotional relationship of mother and affective empathy of father. The significant predictors of girls’ loneliness include emotional relationship and cognitive empathy of father. Parental control is not a significant predictor of adolescents’ loneliness.ConclusionAdolescents’ loneliness is largely influenced by factors of family environment. Our study highlights the role of emotional relationship provided by the opposite sex parent. Cold behavior of the opposite sex parent could reduce self-esteem and self-confidence of adolescents. Both could help them establish relationships with peers and people outside family, thus protecting them against loneliness. A significant predictor of boys’ and girls’ loneliness is also empathy of father. We recommend to make use of our findings in clinical practice with adolescents, in family therapy as well as in context of attachment.Disclosure of interestThe authors have not supplied their declaration of competing interest.
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10
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Pokorná L, Čermáková P, Horváth A, Baile MG, Claypool SM, Griač P, Malínský J, Balážová M. Specific degradation of phosphatidylglycerol is necessary for proper mitochondrial morphology and function. Biochim Biophys Acta 2015; 1857:34-45. [PMID: 26482708 DOI: 10.1016/j.bbabio.2015.10.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Revised: 09/22/2015] [Accepted: 10/15/2015] [Indexed: 02/01/2023]
Abstract
In yeast, phosphatidylglycerol (PG) is a minor phospholipid under standard conditions; it can be utilized for cardiolipin (CL) biosynthesis by CL synthase, Crd1p, or alternatively degraded by the phospholipase Pgc1p. The Saccharomyces cerevisiae deletion mutants crd1Δ and pgc1Δ both accumulate PG. Based on analyses of the phospholipid content of pgc1Δ and crd1Δ yeast, we revealed that in yeast mitochondria, two separate pools of PG are present, which differ in their fatty acid composition and accessibility for Pgc1p-catalyzed degradation. In contrast to CL-deficient crd1Δ yeast, the pgc1Δ mutant contains normal levels of CL. This makes the pgc1Δ strain a suitable model to study the effect of accumulation of PG per se. Using fluorescence microscopy, we show that accumulation of PG with normal levels of CL resulted in increased fragmentation of mitochondria, while in the absence of CL, accumulation of PG led to the formation of large mitochondrial sheets. We also show that pgc1Δ mitochondria exhibited increased respiration rates due to increased activity of cytochrome c oxidase. Taken together, our results indicate that not only a lack of anionic phospholipids, but also excess PG, or unbalanced ratios of anionic phospholipids in mitochondrial membranes, have harmful consequences on mitochondrial morphology and function.
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Affiliation(s)
- Lucia Pokorná
- Department of Membrane Biochemistry, Institute of Animal Biochemistry and Genetics, Slovak Academy of Sciences, Ivanka pri Dunaji, Slovakia
| | - Petra Čermáková
- Department of Biochemistry, Faculty of Natural Sciences, Comenius University, Bratislava, Slovakia
| | - Anton Horváth
- Department of Biochemistry, Faculty of Natural Sciences, Comenius University, Bratislava, Slovakia
| | - Matthew G Baile
- Department of Physiology, School of Medicine, Johns Hopkins University, Baltimore, MD, USA
| | - Steven M Claypool
- Department of Physiology, School of Medicine, Johns Hopkins University, Baltimore, MD, USA
| | - Peter Griač
- Department of Membrane Biochemistry, Institute of Animal Biochemistry and Genetics, Slovak Academy of Sciences, Ivanka pri Dunaji, Slovakia
| | - Jan Malínský
- Microscopy Unit, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Mária Balážová
- Department of Membrane Biochemistry, Institute of Animal Biochemistry and Genetics, Slovak Academy of Sciences, Ivanka pri Dunaji, Slovakia.
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Plachá M, Balážová M, Kováč V, Katina S. Age and growth of non-native monkey gobyNeogobius fluviatilis(Teleostei, Gobiidae) in the River Ipeľ, Slovakia. Folia Zoologica 2010. [DOI: 10.25225/fozo.v59.i4.a10.2010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Mária Plachá
- Department of Ecology, Faculty of Natural Sciences, Comenius University, Mlynská dolina, 842 15 Bratislava, Slovakia;,
| | - Mária Balážová
- Department of Biology and Ecology, Pedagogical Faculty, Catholic University, Námestie A. Hlinku, 034 01 Ružomberok, Slovakia
| | - Vladimír Kováč
- Department of Ecology, Faculty of Natural Sciences, Comenius University, Mlynská dolina, 842 15 Bratislava, Slovakia;,
| | - Stanislav Katina
- Department of Applied Mathematics and Statistics, Faculty of Mathematics, Physics and Informatics, Comenius University, Mlynská dolina, 842 48 Bratislava, Slovakia
- Department of Statistics, University of Glasgow, University Gardens G12 8QQ Glasgow, Scotland
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